<#-->

<#---->

布尔类型
${flag?c}
${flag?string("1","2")}
<hr>
时间类型
${date?time}
${date?date}
${date?datetime}
<hr>
数值类型
${num1}
${num2}
${num2?c}
${num3?float}
${num3?int}
${num2?string.currency}
${num1?string.percent}
${num3?string["0.#"]}
<hr>

${str1!""}
${str1!"我是空"}
${(str1??)?string("true","flase")}
${(str2??)?string("true","false")}


